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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d30a7d8c3c50f22809e47d0efdf771319e340cb4d715c02d92d9f4fccdf36c' 
  AND token = 'NnNyraeTTureWtmU+9pCuuKWCfsux2WDwJu1deau7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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