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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd3645faaddd3df4e640a737731497359ea97642aebb0f4a28fa89bd76e9fe8' 
  AND token = 'NB71/NjjLosgWYtmWv2Oi3EsVJM43LUBUfeySLC/IyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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