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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9586bb311ddadfecf8de4a453bb7ac13da58f14ece0510fc3c9776649ece3ba0' 
  AND token = '6K+RmnRJ5Msawiz+R9u49OF95S52DFfbdqVpc/o/2tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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