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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d3e763fb8933b446a38c6f0096524b6fef8ae41239aa1163c1e6be5fc56855' 
  AND token = 'TMHprfgIr5HfqroyOKkJweCAMi7PUermNCz/8v3W0sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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