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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c40432c38ec71f4a0aa2251d9372e30ae7f4ec495b7acc5dd0ece2cbf1f5ca' 
  AND token = 'wt4V1h/wLkgnhsjazakzzFS9pi3vWequZ95ZFVsQs90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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