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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f7b25ea16b55a34990cc5051e63da465de4a3b2616f80eff845a448090d403' 
  AND token = 'WDG9D1cpd/VaKtwC6iqY1RHmr0hHnrh1283IPg5L6c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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