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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67b38eec49f09363c1c06f75bf56da6a2647532848dc648a7503876c62cf404' 
  AND token = 'NBtc50QbCnbtMSIq8R3Fbgm/SKBQOY1fiIMyZh3SEWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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