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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b7f62437f69faf998a022c726167ecf3192176478d127ab423d1994dfe893c' 
  AND token = 'uLZd8lb3cR35rIHnMicGWPXgaNC9OSKoNRGXvYpeCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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