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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d691f7ecce012343eca306775cb4003ebac14fc6d4dea284bc08f7638e24e8' 
  AND token = 'OBqB1bGrhW6lM1Vmvw6W1VLjnn+Q7mku8A4OViLVB8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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