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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bee52be3acde21204559f1a168161d84316abbcfc67ae85a74118c737374c8' 
  AND token = 'A/lcx1G6rZNN4S3yUhJx9/Y3Y+Za0HIJUB+buUlkorQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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