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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3ceb4d2ddb0442d5cf5480e28a0bc45c5d1911eeda6e496857d0d4e8fde3fa' 
  AND token = '+1AcSrVr9QoykGVyvGAxjZTeldh3pYRUXrJYxn9Lmeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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