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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbdb5fb9c392d1c3b9798a87d94d0186f6f3c958cb0cc72fd7e8ed46d867aa2' 
  AND token = 'kgBHZoNyZTovi6/abx+Dqti6D969bkSyQbkZNn0HKA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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