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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e56468f1aa7db0dc3a4961c71baf370a11b5828160dc0f6d13b7cf3376f6add' 
  AND token = '/05zDM5bCIM9bdyC1buND57n9mWShR+ZU3ZD/xUV2YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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