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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2ee19e6825dbcbfb3add583efa4e1ee5781db7d9f56a084df2710ba73560f9' 
  AND token = '+0ujheTBbYNaYG7NBoLcbQpV8Q7n30YjwATiPzJ4b34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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