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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513e2aeeb873ed40dd57246f654840beaae52f079f3d255420906d4e55b9d463' 
  AND token = 'jF2w0o8J+MWgpz9MhajrdY6DwWw35CJ/YqOxVU+z8a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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