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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3724fe74c7ebb8dd3e3999a30e481b70b5b7188dbbab11fd1ef802980b6d20' 
  AND token = 'bsFXs83JmPSZoCnUTlWhDdmh39QB5BzDMkEY9o/P500=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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