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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5135dc9c65cd862dd8e01d02f9a2e88de56587ce6626f1aa4197b066eb139628' 
  AND token = 'vWsSjnBdM5H1XIsfNnoJr3jf3jdWbiHzK50Muvi9AYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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