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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac48356b85d1c0edb77850186a42d2068034965555aa4eec1e1ca9ed61da533' 
  AND token = 'tR9DyIc9E8cMOlqk1724oFHed0xuYGLY4FBfINq6nWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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