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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4744c53b57b413ad63e560c5be784769c2ad2d45adbf506cd94f773508810c2c' 
  AND token = '/TK/MHSyyOOxl2tDTL4JibOD4zrJpq0boSkShd3lpXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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