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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447ee03a522cad91ef547a3221260ca228b33d9bbe8318378ae23d119109d3c6' 
  AND token = 'M1ZQNejjahG/I+irVwjsguc2vKO3f6rDIe0X860/5ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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