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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c38e265aae0f78d15b6dde4bb0b3ec0255bb3a7badca1acdd29460291464152' 
  AND token = '9QmwN9tfCy4MeRSMmxzHzYcMvCojlwOYSsiOIdZ0rn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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