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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf3023edecdd22ff30f4ce8f5ad1f36e80d988b05487f59e708cf48dd2482fd' 
  AND token = 'EzOgUn5PNZemJMZyI1ENmvW6LuJ4mv2z3I7kVMM6jus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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