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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76b753887ee73dd63b8a026883fd225aa46635aa57ae6cc9866049b66873493' 
  AND token = 'NBViyn1VdYiglwvmVClq6Rmdp1tT0aqNCbL3A7YZ6N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}