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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034d5b7dc8d78390b3c5b4648670bb52b3c2b5c87d3fcec5ccff69e5d7bf67f4' 
  AND token = 'qvy2WwwcWY2cNA9ojnMU6lMs+W26a4dtIBb8cVuAktQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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