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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436e6cf0c40b93638224c0eac740c498cbe1a2dfd0fa76fbbbf97ac86e6ff3f' 
  AND token = 'AtyGGLLgn3akOYW7In7PzEzS63Lf98GqWrMocnhgK4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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