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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80456f59ce4bf73f67b6e9df9aae6743a327ccd6c45ea2d7c9cead5e0f4068e' 
  AND token = 'BqF6xKKBrere8tbsEMisljBGxnGVz9QPiKQHxqlbaMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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