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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6920f497b00fb22b9ca6277a1dde1a79f4fb3fc4dd09a0fc436f165a03183cb' 
  AND token = 'LbAR3oRXGq4OBFsgBqA7ksmk3yEq7X7u4z4OWWf6ArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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