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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee65449811bef07b2f1a8be8ff244ed96a696ed5aafc5a1dd7cfaa5869699a57' 
  AND token = 'TM2wM1x2LXMEgnfSLvHAuhsarTM6yVWLxodvxuLHe/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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