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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6552499dd7956d679f8bfb13b127637ae44cc13ff07cf86e238cded9ca922af4' 
  AND token = '8vuR4TX0Vetss4LsuqTssaxK1jlaZG8/Gg3Dw11df/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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