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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2f7d12bd94eaa72d0712a63462e50d0ceb8df10e217895f4142592ec14fd17' 
  AND token = 'c6Aea/51NVONMFg4PPcyNjFls5NnlUX31dLBQ5+Z0IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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