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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15384efd0bc3038b19aae6cd58c9592d9a0ccc2a35100a3745ee8942b85feb6' 
  AND token = 'sOJRWnhTZDmJI5M6SBavHg3Rb41fpytyWNxZgjjiVKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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