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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72631399ab9721b2e0d5a7bd0a3bfdfe1609a87d92929945b4ef01b8126356b' 
  AND token = 'Ple7iX0KmY3aT6K5AwZ6rClx5sLqkU8gk/sl9+v8K4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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