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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac34dea5605b893ea92bef347971a83f74fdd442984bfeb0af091fe09d04973' 
  AND token = 'jLbTt0c+aP1sJzl7wgszzNfW7LfGgcrQ0ohrTCijaxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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