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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3711095f110d853b8833a5a1ec7243621252647c6a50dd99a9ca0d80d2907aa3' 
  AND token = 'zBHKwWvGQgfNLUo5/WeJMLq650Mtn/XGLo4F5PnPXc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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