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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd14b08820eee6bd554fbaff0640fd80ebd91504f4c50403d3f2d83a83c11b0' 
  AND token = 'K56JERFLoqmPszgE8naNlIAa3y47T+3JFrpzExdC+YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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