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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a27e923b52daacb303c0ad740be01edda08ddffa9e77907f872ac7c8834ed8b' 
  AND token = 'Z5y6jNx/CJVcZD1lfhtlLQcsDdwnOyeTVcxxd43A180=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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