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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2787becf6f2b4cdd8c2daf0d90dc439c3b4c9c74a49ea4af88c4ef6d40a2b81' 
  AND token = 'KYgx9tNaZ0z6m13G3qtyiODxKexZfOZzx1ubVyuQXGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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