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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a608a5b90c311937fb561a5d4f5c0d5852861191db5a5bca4682fbaebbc6a8' 
  AND token = 'V9Akb/roQGVUhDEf9m3w4bP6knZhjdWXB5opaCXZ/lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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