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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fe3b9bcdd00ef37f188a5c00132764dc55f30eec904df8b7ca60fcb9b384fc' 
  AND token = 'gPW4vuL7wjQLqqawo3NeXWTk/UC/VD/p8qeVf6HK3vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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