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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21290a827b2b13adc4ad8833a7fcad252717945752d4ef50180117e9b6f10edf' 
  AND token = 'Tl+d8MUjdkY0veQHGI3wH0FC2Ao79oZwK6RoAL34la4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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