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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd513892d460a71d54151d23c3c5ca004207d4433e052bd0919ba2bbcebf16d1' 
  AND token = '7CVvyda6vyGSLxB/pL/+qSbXI6c3+JhcyQznuGUGHxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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