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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5866415330d048ba9bd80bdf7ff457f63e5670041d684bca7615541e11c1142' 
  AND token = 'r2VbLok9/soSk7C3NCDauiAb43R0CTevmm3zWvLETpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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