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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae312cb41fe7cbcfd71adb32b710d9b2f60f3cff80ad8c3b5930dd20d57d9a2' 
  AND token = '0vEyuwwreFBMX6MRAmRFiB8xQzL5EeOypl4u7OqTcb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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