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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9339aa75110618d3e934506e3db7ea6fe0716c0354f034dcc9164ae4db62542' 
  AND token = 'SAe4ARXSJ/Uv5PxQIGvzGQ85vMFVHFdZk+6OOQRtEP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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