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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13495446aa52e26eec2e80a32eaa0d1cf967e3dd0d4adbb20f5880bd5b6676d9' 
  AND token = 'kF2Go/KWyn/cJE89AzOMnCZy4IKLiAbgibOkgO0DDJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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