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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa47943e5b929005419c25ad538bd680cd2ed71cfec618c6a3e21cf54ffa916b' 
  AND token = 'vbF8AIiDdW5yxx0Q1nHvThzSsU3niXiaBpqOsG1rMGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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