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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8344646e4bb5097daeac3e2cd017bc37c365f5a80fcbe2fd1cb2fbceadc6993' 
  AND token = '1oqT6mBKmPy20szB9wT8LiLPy4Kmbs9gYT4vk96aNak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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