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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fad7a1518f1a89e7078efd49f7d2a61325eb89b3b1f11afb0c145532cfd82ba' 
  AND token = 'L9O5PvQ7LLaQOeHO5xXPzqn+YaJkKOJflFJWTiprYlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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