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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93730440ff4bd5b801ff013baad67e898e5a4f6ead3ca9807a37500f0ec2b11' 
  AND token = '7b/BVXKQSuLlLMMNWBCrz3k0QMHV8mJ56TjwZOsZPcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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