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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e02a3ad549c62ef1444a79124ae1b40ebce57898e9293b3c0fcfbd894a9b0b8' 
  AND token = '34Vm3kywvwbolXc+ZbRmgwnpkGSSGqLH1j1SDUAYBhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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