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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c83cf97f62949a92cf63f8f8f1d3246e4c51603f291c585d4b40ab9857a9c12' 
  AND token = 'ihYL4fXlqLx776dnFoeXmowswHCI0BTqgtAbx3DE0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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