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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd8580e8ae3c6fe3eccf5ab271f7f14387ab54580f3d19068a403b64b65670c' 
  AND token = 'iV9OEG3Fn7AYilGXsXiyqcwb1UJv5zKU7ybIszv349k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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