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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb3630a7cf4a3cb1a0238c2d835bd02bb846a759b2b14f7c3d49a1cb0a6e332' 
  AND token = 'ZXyNg+3D/yuCyuOFQ9OCWiyerw1WQ6vF08sWUQEQNzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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