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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995fd8735eee314ed7dac71d6e521ce31573fec6a8fdf89e954e4515bea2d492' 
  AND token = '/cPHkZvlFXA4M8knQBp5fAbQY8NUvmq1eLoyscnsNKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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