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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e7be6ef5fdf7ce17368a40a689d82a3e230900f09bf32e98f37f0be427d75b' 
  AND token = 'YtFrQybItaWKzXHqcxwQ0TLwPfv3zV1i2hkeVHZ+zxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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