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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bca6da9b16b7f06e9459505fdac456147151e58b47084e40a06c4b1a976b96' 
  AND token = 'pb8xmXgzBHLx5a9h/HHnn2Av2TwDx3q7e8PXS2eR/SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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