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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bad25588d7290e4601094f59fc5c05e60aded85d71e6af3dfec25d31fd8daa' 
  AND token = 'fyOE9cBqbO6mmbM/YCkjlAw6/g5ds6FjpUJ4EYPBeeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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