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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3773cd58ff029a2c3a40f14c0bcff2fd82f979bd8ed2a55984fb15de2fbbde' 
  AND token = 'VI0J9FW4L3/VQpB0RKVAXfJTaO8yxJS4Cn8XtRlNFQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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