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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82d21ba429cf71400747f235523f9b31e3f35e4478013935100cb7100b47e61' 
  AND token = 'ClzVlTj44635J41+M5jfhpEL6j2PAnYyl5x0JimsGQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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