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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d41ab0ef6bb2d2f60d246dfd05f25d5900aff656ded4dccbec5844d255a092' 
  AND token = '7PKOWGxeKtyhdW+msTIwUB/Td0LerDukcOqWCwmRidc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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