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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fc7cec65b33b3a4e52f714222108838a58edbba1fea20a3a9f5f372bdb578d' 
  AND token = 'B/yLE+1uUaZ7mM8UC3As/UNM5iFpjD8DvMwjvIDHl+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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