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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd300813aa591a391bcc2764dc55e6a64913accea125faca41825b3381e00d45a' 
  AND token = 'JMTx5MY1tPCxUya23msbQaNyT1Ua58E1EvjI8OZJl60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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