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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc81513769f75bbd7c7cb980ea64916763a7ed54ebb838fe5e12e26d1512845' 
  AND token = '/BCOhyJ5hxzSRhXUrEFtb/xQBuG7F8vYitr4mQ8oco8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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