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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370a6722f058c959dee9f2a3cfbc9a50d0cd96ae1eaf0c0c9c200a0868f3b8de' 
  AND token = 'fGjTPybLrRQpGR6YgT/q5pzFWcvfLXmQItTkPGo7BPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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