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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde3b25a975fa6dfb7a965040eaf8e7a02faac26ad278a867d299f5924f534aa' 
  AND token = 'Mh/K0cv9EbAK7Pfwhb5tFssgsXgZ68NwkLdu3PO8uEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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