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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcd6ad73cfea3549e95bae5f75c06bc946e737e7892f3a041fa0e46183ba11d' 
  AND token = '08JSPeZS1EpUVh5HMeEZPHcYQ+sJwNrngpeWUlP4RfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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