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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f838600bb26ae23c5723689b3c6e93a4e76e9d09b8311f536af117be8e7830' 
  AND token = 'UJjhNrxWVOVJ2a84qTOhY8Vr73q6/Y6ZpX10xM5fbPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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